Midday at the senior center in Dickson, and Police Sergeant David Cole is giving his audience a pep talk.
He admits that seemingly random killings have injected an element of fear into public life. One that could lead people to conclude that they're defenseless any time they gather together.
"And some people would say, 'I can defend against it. I won't go,'" he says, triggering a knowing chuckle from the audience. "Well, if you don't do that, they win. They win."